Exercise device



FIG. 1 is a front elevation view of an exercise device showing my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a side view thereof.

The broken lines depict portions of the exercise device in which the design is embodied that are not considered part of the claimed design. 

CLAIM I claim the ornamental designs for an exercise device, as shown and described. 